Research into the reaction process and the effect of reaction conditions on the simultaneous removal of H<sub>2</sub>S, COS and CS<sub>2</sub> at low temperature

Sun, Xin; Ruan, Haotian; Song, Xin; Sun, Lei; Li, Kai; Ning, Ping; Wang, Chi

doi:10.1039/c7ra12086a

Cited by 38 publications

(13 citation statements)

References 28 publications

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“…Sun et al pointed out that the hydrolysis of COS is a typical base-catalyzed reaction. The surface alkalinity of the catalyst played an important role in the adsorption of COS and the subsequent catalytic hydrolysis .…”

Section: Resultsmentioning

confidence: 99%

Contribution of Na/K Doping to the Activity and Mechanism of Low-Temperature COS Hydrolysis over TiO₂-Al₂O₃ Based Catalyst in Blast Furnace Gas

Liu

Shen

et al. 2022

ACS Omega

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As an organic sulfur pollutant generated in blast furnace gas, carbonyl sulfide (COS) has attracted more attention due to its negative effects on the environment and economy. The TiO 2 -Al 2 O 3 composite metal oxide (Ti 0.5 Al) with uniformly dispersed particles was prepared by the co-precipitation method. And on this basis, a series of Na/K-doped catalysts were prepared separately. The activity evaluation results showed that the introduction of Na/K significantly improved the low-temperature COS hydrolysis activity, which exhibited a COS conversion of 98% and H 2 S yield of 95% at 75 °C with 24,000 h –1 . And K showed a better promoting effect than Na. Brunauer–Emmett–Teller (BET) results revealed the increased mesopore proportion of Na/K-modified catalysts. X-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that Na and K formed prismatic and nanorod-like structures, respectively. More weakly basic sites with enhanced intensity and decreased O ads /O lat content contributed to the excellent catalytic activity, as certified by the results of CO 2 temperature-programmed desorption (CO 2 -TPD) and X-ray photoelectron spectroscopy (XPS). It was also proposed that the decrease of weakly basic sites ultimately deactivated catalyst activity. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) showed that the introduction of Na/K enhanced the dissociation of H 2 O, and the generated abundant hydroxyl groups promoted the adsorption of COS and formed surface transition species, such as HSCO 2 – and HCO 3 – .

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Section: Resultsmentioning

confidence: 99%

Contribution of Na/K Doping to the Activity and Mechanism of Low-Temperature COS Hydrolysis over TiO₂-Al₂O₃ Based Catalyst in Blast Furnace Gas

Liu

Shen

et al. 2022

ACS Omega

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“…Combined with Figure 9 and Table 7, the penetration time increased gradually with the decrease of water vapor content. As the adsorption potential energy of H 2 O is −18.46 kJ/mol and that of COS is −5.11 kJ/mol, [18] the catalyst would preferentially absorb water vapor. FTIR results show that the catalyst itself contains a large amount of water, sufficient for catalytic hydrolysis.…”

Section: Resultsmentioning

confidence: 99%

Research on the Catalytic Hydrolysis of COS by Fe−Cu/AC Catalyst and Its Inactivation Mechanism at Low Temperature**

Han

Zhang

2022

ChemistrySelect

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For removing carbonyl sulfide (COS) from industrial waste gas at low temperatures, the critical approach is to prepare an efficient and cheap catalyst. In this paper, Fe/Cu modified coal‐based activated carbon (AC) was prepared by co‐precipitation method and tested for the catalytic hydrolysis of carbonyl sulfide (COS) at low temperatures in a fixed‐bed reactor. The results showed that the best mole ratio of Fe/Cu was 1 : 1 and the best content of metal oxides was 50 %. BET, XRD, XPS, FTIR, and SEM investigated the structure and surface properties. COS was hydrolyzed on Fe2O3 to produce H2S and CO2, and H2S reacted with CuO to have CuS. At the same time, H2S reacted with Fe2O3 to produce FeS and elementary sulfur. Oxidized elemental sulfur was to form sulfuric acid, which responded with Fe2O3 to form sulfates. The sulfates would be deposited on the catalysts’ surface and block the pore structure. Deactivation of metal oxides and blockage of pore structures were the main reason for catalyst deactivation.

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“…[18] In addition, the vibration peaks of FeÀ O in Fe 2 O 3 appear at 670, 587 and 478 cm À 1 . [19] After the desulfurizer removes H 2 S, a new absorption peak appears at 1130 cm À 1 , which belongs to sulfate radical. [20] And the peak of elemental sulfur at 600 cm À 1 overlaps with the peak of Fe 2 O 3 at 577 cm À 1 , which makes the peak in 550-620 cm À 1 region wider and stronger.…”

Section: Xrd Analysis Of Fe/ac Desulfurizersmentioning

confidence: 99%

Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H₂S at Low Temperature

et al. 2020

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Fe/activated carbon desulfurizer is prepared by precipitation method using activated carbon as carrier to remove H2S. The desulfurizer before and after desulfurization was characterized by XRD, XPS, SEM and N2 adsorption–desorption. The results show that the active component of desulfurizer is Fe2O3, which reacts with H2S to form FeS, elemental sulfur and Fe2(SO4)3. The sulfide block the pores, causing the specific surface area, pore volume and fractal dimension to decrease after desulfurization. The effects of gas flow rate, particle size and temperature on the removal of H2S were investigated by solid‐bed reactor. Based on the above experimental data, an improved unreacted shrinking core model is used to study the kinetics of Fe/activated carbon desulfurization at low temperature. The improved unreacted shrinking core model is used to analyzing experimental data, in which the activation energies of surface reaction and internal diffusion were determined to be 0.8801 and 3.301 kJ/mol, respectively.

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Research into the reaction process and the effect of reaction conditions on the simultaneous removal of H₂S, COS and CS₂ at low temperature

Abstract: The removal processes of COS, CS2 and H2S could be divided into two parts: a catalytic hydrolysis reaction and a catalytic oxidation reaction.

Cited by 38 publications

References 28 publications

Contribution of Na/K Doping to the Activity and Mechanism of Low-Temperature COS Hydrolysis over TiO₂-Al₂O₃ Based Catalyst in Blast Furnace Gas

Contribution of Na/K Doping to the Activity and Mechanism of Low-Temperature COS Hydrolysis over TiO₂-Al₂O₃ Based Catalyst in Blast Furnace Gas

Research on the Catalytic Hydrolysis of COS by Fe−Cu/AC Catalyst and Its Inactivation Mechanism at Low Temperature**

Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H₂S at Low Temperature

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Research into the reaction process and the effect of reaction conditions on the simultaneous removal of H2S, COS and CS2 at low temperature

Abstract: The removal processes of COS, CS2 and H2S could be divided into two parts: a catalytic hydrolysis reaction and a catalytic oxidation reaction.

Cited by 38 publications

References 28 publications

Contribution of Na/K Doping to the Activity and Mechanism of Low-Temperature COS Hydrolysis over TiO2-Al2O3 Based Catalyst in Blast Furnace Gas

Contribution of Na/K Doping to the Activity and Mechanism of Low-Temperature COS Hydrolysis over TiO2-Al2O3 Based Catalyst in Blast Furnace Gas

Research on the Catalytic Hydrolysis of COS by Fe−Cu/AC Catalyst and Its Inactivation Mechanism at Low Temperature**

Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H2S at Low Temperature

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Resources

About

Research into the reaction process and the effect of reaction conditions on the simultaneous removal of H₂S, COS and CS₂ at low temperature

Contribution of Na/K Doping to the Activity and Mechanism of Low-Temperature COS Hydrolysis over TiO₂-Al₂O₃ Based Catalyst in Blast Furnace Gas

Contribution of Na/K Doping to the Activity and Mechanism of Low-Temperature COS Hydrolysis over TiO₂-Al₂O₃ Based Catalyst in Blast Furnace Gas

Desulfurization Process and Kinetics of Fe/Activated Carbon Removal of H₂S at Low Temperature